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Visual Reinforced Audiometry

As part of hearing assessments or as requested by physicians we are able to conduct a wide variety of subjective and objective clinical audiological tests for adults and children.

Objective Tests

Objective tests are tests which are conducted without the active participation of the patient. Some of these tests are especially useful to test young children who cannot correctly respond or uncooperative adults.

Impedance Audiometry

Impedance Audiometry

This is used to checking the status and the function of the middle ear. This is very important as all future tests rely on a normally functioning middle ear. There are three main tests. The most commonly used test is check the function of the eardrum and the air pressure in middle ear cavity. Another test is the stapedius reflex test. This test measures the contraction of the stapedius muscle in the middle ear. This muscle automatically contracts in the presence of loud sounds to protect the inner ear.

The test is conducted by sealing off the earcanal airtight with a probe. By varying the air pressure in the earcanal the resistance of the eardrum to the pressure can be measured, which allows pressure in the middle ear cavity.

To measure the stapedius reflex the probe products a gradually louder sound until the muscle contraction can be measured on the eardrum which gets more resistance to the probes air pressure.

Subjective Tests

Subjective tests are test where the patients response is used to record a test result.

Visual Reinforced Audiometry

Visual Reinforced Audiometry

For children a pure tone audiogram is often done in a free filed as a visual reinforced audiometry.

In a visual reinforced free field pure tone audiogram, the child will be conditioned with a visual stimulation immediately following the sound.

The child sits in-between two loudspeakers each linked up with a screen. Each time a sound is being offered and the child looks in the correct direction it is rewarded with a visual image. Initially the signal is offered clearly above threshold to condition the child. As the test progresses the signal is being reduced until the child cannot hear anymore, thus the threshold is being established.

Free Field audiometry is often used to verify audibility with hearing aids or cochlear implants for children but also for adults.

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